设数列{an}、{bn}、{cn}满足:bn=an-an+2,cn=an+2an+1+3an+2(n=1,2,3,…),求证:{an}为等差数列的充分必要条件是{cn}为等差数列且bn≤bn+1(n=1,2,3,…).
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设数列{an}、{bn}、{cn}满足:bn=an-an+2,cn=an+2an+1+3an+2(n=1,2,3,…),求证:{an}为等差数列的充分必要条件是{cn}为等差数列且bn≤bn+1(n=1,2,3,…).
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